3 files changed, 73 insertions, 0 deletions
diff --git a/include/cru/platform/native/base.hpp b/include/cru/platform/native/base.hpp
index 5ebd98d6..883a9450 100644
--- a/include/cru/platform/native/base.hpp
+++ b/include/cru/platform/native/base.hpp
@@ -10,6 +10,7 @@ struct ICursorManager;
 struct IUiApplication;
 struct INativeWindow;
 struct INativeWindowResolver;
+struct IInputMethodManager;
 
 struct Dpi {
   float x;
diff --git a/include/cru/platform/native/input_method.hpp b/include/cru/platform/native/input_method.hpp
new file mode 100644
index 00000000..ecc47fd8
--- /dev/null
+++ b/include/cru/platform/native/input_method.hpp
@@ -0,0 +1,30 @@
+#pragma once
+#include "../resource.hpp"
+#include "base.hpp"
+#include "cru/common/event.hpp"
+
+#include <memory>
+
+namespace cru::platform::native {
+// It is a reference, so there is a ref count, remember to destroy it to release
+// the ref after use.
+struct IInputMethodContextRef : INativeResource {
+  // Reset composition string. Use this method to prepare typing.
+  virtual void Reset() = 0;
+  // Get the composition string.
+  virtual std::string GetCompositionString() = 0;
+  // Set the candidate window lefttop. Use this method to prepare typing.
+  virtual void SetCandidateWindowPosition(const Point& point);
+  // Triggered every time composition text changes, evet args is the new
+  // composition text.
+  virtual IEvent<std::string>* CompositionTextChangeEvent() = 0;
+  // User comfirmed compostition. Use this method to get the final input text.
+  virtual IEvent<std::string>* CharEvent() = 0;
+};
+
+struct IInputMethodManager : INativeResource {
+  // Get a reference of context of a window.
+  virtual std::unique_ptr<IInputMethodContextRef> GetContext(
+      INativeWindow* window) = 0;
+};
+}  // namespace cru::platform::native
diff --git a/include/cru/win/native/input_method.hpp b/include/cru/win/native/input_method.hpp
new file mode 100644
index 00000000..3ea16709
--- /dev/null
+++ b/include/cru/win/native/input_method.hpp
@@ -0,0 +1,42 @@
+#pragma once
+#include "resource.hpp"
+
+#include "cru/platform/native/input_method.hpp"
+
+#include <imm.h>
+
+namespace cru::platform::native::win {
+class WinNativeWindow;
+
+class WinInputMethodContextRef : public WinNativeResource,
+                                 public IInputMethodContextRef {
+ public:
+  WinInputMethodContextRef(WinNativeWindow* window);
+
+  CRU_DELETE_COPY(WinInputMethodContextRef)
+  CRU_DELETE_MOVE(WinInputMethodContextRef)
+
+  ~WinInputMethodContextRef() override;
+
+  ::HIMC GetHandle() const { return handle_; }
+
+  void Reset() override;
+
+  std::string GetCompositionString() override;
+
+  void SetCandidateWindowPosition(const Point& point) override;
+
+  IEvent<std::string>* CompositionTextChangeEvent() override;
+
+  IEvent<std::string>* CharEvent() override;
+
+ private:
+  WinNativeWindow* window_;
+
+  ::HWND window_handle_;
+  ::HIMC handle_;
+
+  Event<std::string> composition_text_change_event_;
+  Event<std::string> char_event_;
+};
+}  // namespace cru::platform::native::win